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<title>Using as: VAX-Opts</title>

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<a name="VAX_002dOpts"></a>
<div class="header">
<p>
Next: <a href="VAX_002dfloat.html#VAX_002dfloat" accesskey="n" rel="next">VAX-float</a>, Up: <a href="Vax_002dDependent.html#Vax_002dDependent" accesskey="u" rel="up">Vax-Dependent</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="VAX-Command_002dLine-Options"></a>
<h4 class="subsection">9.48.1 VAX Command-Line Options</h4>

<a name="index-command_002dline-options-ignored_002c-VAX"></a>
<a name="index-VAX-command_002dline-options-ignored"></a>
<p>The Vax version of <code>as</code> accepts any of the following options,
gives a warning message that the option was ignored and proceeds.
These options are for compatibility with scripts designed for other
people&rsquo;s assemblers.
</p>
<dl compact="compact">
<dd><a name="index-_002dD_002c-ignored-on-VAX"></a>
<a name="index-_002dS_002c-ignored-on-VAX"></a>
<a name="index-_002dT_002c-ignored-on-VAX"></a>
</dd>
<dt><code><code>-D</code> (Debug)</code></dt>
<dt><code><code>-S</code> (Symbol Table)</code></dt>
<dt><code><code>-T</code> (Token Trace)</code></dt>
<dd><p>These are obsolete options used to debug old assemblers.
</p>
<a name="index-_002dd_002c-VAX-option"></a>
</dd>
<dt><code><code>-d</code> (Displacement size for JUMPs)</code></dt>
<dd><p>This option expects a number following the &lsquo;<samp>-d</samp>&rsquo;.  Like options
that expect filenames, the number may immediately follow the
&lsquo;<samp>-d</samp>&rsquo; (old standard) or constitute the whole of the command line
argument that follows &lsquo;<samp>-d</samp>&rsquo; (<small>GNU</small> standard).
</p>
<a name="index-_002dV_002c-redundant-on-VAX"></a>
</dd>
<dt><code><code>-V</code> (Virtualize Interpass Temporary File)</code></dt>
<dd><p>Some other assemblers use a temporary file.  This option
commanded them to keep the information in active memory rather
than in a disk file.  <code>as</code> always does this, so this
option is redundant.
</p>
<a name="index-_002dJ_002c-ignored-on-VAX"></a>
</dd>
<dt><code><code>-J</code> (JUMPify Longer Branches)</code></dt>
<dd><p>Many 32-bit computers permit a variety of branch instructions
to do the same job.  Some of these instructions are short (and
fast) but have a limited range; others are long (and slow) but
can branch anywhere in virtual memory.  Often there are 3
flavors of branch: short, medium and long.  Some other
assemblers would emit short and medium branches, unless told by
this option to emit short and long branches.
</p>
<a name="index-_002dt_002c-ignored-on-VAX"></a>
</dd>
<dt><code><code>-t</code> (Temporary File Directory)</code></dt>
<dd><p>Some other assemblers may use a temporary file, and this option
takes a filename being the directory to site the temporary
file.  Since <code>as</code> does not use a temporary disk file, this
option makes no difference.  &lsquo;<samp>-t</samp>&rsquo; needs exactly one
filename.
</p></dd>
</dl>

<a name="index-VMS-_0028VAX_0029-options"></a>
<a name="index-options-for-VAX_002fVMS"></a>
<a name="index-VAX_002fVMS-options"></a>
<a name="index-Vax_002d11-C-compatibility"></a>
<a name="index-symbols-with-uppercase_002c-VAX_002fVMS"></a>
<p>The Vax version of the assembler accepts additional options when
compiled for VMS:
</p>
<dl compact="compact">
<dd><a name="index-_002dh-option_002c-VAX_002fVMS"></a>
</dd>
<dt>&lsquo;<samp>-h <var>n</var></samp>&rsquo;</dt>
<dd><p>External symbol or section (used for global variables) names are not
case sensitive on VAX/VMS and always mapped to upper case.  This is
contrary to the C language definition which explicitly distinguishes
upper and lower case.  To implement a standard conforming C compiler,
names must be changed (mapped) to preserve the case information.  The
default mapping is to convert all lower case characters to uppercase and
adding an underscore followed by a 6 digit hex value, representing a 24
digit binary value.  The one digits in the binary value represent which
characters are uppercase in the original symbol name.
</p>
<p>The &lsquo;<samp>-h <var>n</var></samp>&rsquo; option determines how we map names.  This takes
several values.  No &lsquo;<samp>-h</samp>&rsquo; switch at all allows case hacking as
described above.  A value of zero (&lsquo;<samp>-h0</samp>&rsquo;) implies names should be
upper case, and inhibits the case hack.  A value of 2 (&lsquo;<samp>-h2</samp>&rsquo;)
implies names should be all lower case, with no case hack.  A value of 3
(&lsquo;<samp>-h3</samp>&rsquo;) implies that case should be preserved.  The value 1 is
unused.  The <code>-H</code> option directs <code>as</code> to display
every mapped symbol during assembly.
</p>
<p>Symbols whose names include a dollar sign &lsquo;<samp>$</samp>&rsquo; are exceptions to the
general name mapping.  These symbols are normally only used to reference
VMS library names.  Such symbols are always mapped to upper case.
</p>
<a name="index-_002d_002b-option_002c-VAX_002fVMS"></a>
</dd>
<dt>&lsquo;<samp>-+</samp>&rsquo;</dt>
<dd><p>The &lsquo;<samp>-+</samp>&rsquo; option causes <code>as</code> to truncate any symbol
name larger than 31 characters.  The &lsquo;<samp>-+</samp>&rsquo; option also prevents some
code following the &lsquo;<samp>_main</samp>&rsquo; symbol normally added to make the object
file compatible with Vax-11 &quot;C&quot;.
</p>
<a name="index-_002d1-option_002c-VAX_002fVMS"></a>
</dd>
<dt>&lsquo;<samp>-1</samp>&rsquo;</dt>
<dd><p>This option is ignored for backward compatibility with <code>as</code>
version 1.x.
</p>
<a name="index-_002dH-option_002c-VAX_002fVMS"></a>
</dd>
<dt>&lsquo;<samp>-H</samp>&rsquo;</dt>
<dd><p>The &lsquo;<samp>-H</samp>&rsquo; option causes <code>as</code> to print every symbol
which was changed by case mapping.
</p></dd>
</dl>

<hr>
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Next: <a href="VAX_002dfloat.html#VAX_002dfloat" accesskey="n" rel="next">VAX-float</a>, Up: <a href="Vax_002dDependent.html#Vax_002dDependent" accesskey="u" rel="up">Vax-Dependent</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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